Acton did not follow up to his tweet, which sends a mixed message about parent company Facebook (surely Mark Zuckerburg can’t be happy about the message). According to The Verge, Acton has not replied to a request for comment.

The WhatsApp co-founder last month invested $50 million into Signal, a WhatsApp alternative which offers encrypted end-to-end messaging.

Definitely a weird tweet from Acton—let’s see what he has to say next about his tweet, and whether it was actually him sending the message or a “hacker”.